i have been having this problem now for few months and i finally decided to get help about this once and for all.

The problem is that I cannot connect more than once device at a time to ANY timewarner cable modem. Yes i have exchnaged them multiple times. This time i got ARRIS TG 862 its a brand new modem with router.

So the problem is i cannot connect more than once device at a time. cannot connect with wire or wireless. For example, i can connect my laptop using Wire, then i will not be able to connect my other laptop, not with wire and not with wireless. Another scenario, if i connect my one laptop using wireless, i am unable to connect anything else wireless or with wire. This happens with everything, iphone, ipad, laptops, desktop, my friends laptops.

Currently to solve this problem i have attached a cisco e4200 to timewarner modem. But still i don't feel like having two routers, when one can perform everything why should i need to have another?

I work for the "other" cable company and we use the same modem. What you need to do is go inside the modem and click on the DHCP section and make sure you have at least 20 on there. It may be set to just 1.

Whenever you swap devices connected in you need to unplug the power from the cable modem since it locks in the MAC address once it learns it. Not sure what the problem is but that's a good bit to keep in mind.

Granted, router -> cable modem remembers the mac and it's fine connecting to the router. But if you unplug the router and plug something else in directly it will block it since it remembers the MAC of the router.

I ran into the same issue- My solution was the same as yours about adding a home router.

It is like they say when I had that one- That router- (which I now have a ubee router from them but still prefer the home router because I can get faster wireless speeds) locks itself to the computer it is attached to.

For me the easy way - was to have the home router setup to have the computer-remember the computer's mac address and setup the wireless for me I can now have up to 4 wired and as many wireless that I want.

another strange thing happening is that when i try to change bridged mode into nat, and as settings recommend to restart router with this change, its changed back into bridge automatically: like when i change it and restart router to take effect bridge mode is there.

Maybe thats how your isp has it setup? So what IP do you get when you connect your 1 device - do you get a 192.168 address from the router or do you get a public IP from your isp?

I will have to look up what that mode does exactly? But bridge in any normal sense would mean you get IP from what is before that device.. A bridge does not do NAT.. which is what you need to share multiple devices with only 1 public IP that most isp only give. Can you buy more IP from your isp?

And on your device connected to it that gets internet - what is the output of ipconfig /all